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Thoughts on dfm disabler for GM trucks
Posted on 9/13/26 at 1:02 pm
Posted on 9/13/26 at 1:02 pm
Anyone installed one and was there improvement?
Is it a good thing for the engine and longevity ?
Fuel mileage decrease?
What exactly does it do and best brand?
Thanks in advance-
Is it a good thing for the engine and longevity ?
Fuel mileage decrease?
What exactly does it do and best brand?
Thanks in advance-
Posted on 9/13/26 at 1:10 pm to Jim bean xxx
I use a range device on my 6.2L.
It will buy you time but the AFM lifters are still inside the engine and are still prone to failure. IE it doesn't remove the problem entirely. The only way to get rid of the problem for good is new lifters, non-afm cam, and a tune, which is a pretty expensive proposition if you pay a shop to do it.
There is no change in performance and it would be difficult to measure any change in fuel economy.
ETA: If you haven't committed to getting the internal engine work done it is definitely worth doing (my range device was $150 or so going by memory).
It will buy you time but the AFM lifters are still inside the engine and are still prone to failure. IE it doesn't remove the problem entirely. The only way to get rid of the problem for good is new lifters, non-afm cam, and a tune, which is a pretty expensive proposition if you pay a shop to do it.
There is no change in performance and it would be difficult to measure any change in fuel economy.
ETA: If you haven't committed to getting the internal engine work done it is definitely worth doing (my range device was $150 or so going by memory).
This post was edited on 9/13/26 at 1:12 pm
Posted on 9/13/26 at 1:12 pm to Jim bean xxx
I guess it's a cost/benefit analysis of comparing the disabler cost plus the extra fuel cost against the cost of repair for when the lifters fail. I would assume the lifter repair is more expensive.
Is it safe to assume at some point in a GM the lifters will fail? If so, the disabler sounds like it may be worth it to me
Is it safe to assume at some point in a GM the lifters will fail? If so, the disabler sounds like it may be worth it to me
Posted on 9/13/26 at 1:12 pm to Jim bean xxx
I can give you 11,580 reasons to install one before those P.O.S. lifters collapse into your cylinders.
Posted on 9/13/26 at 1:12 pm to Jim bean xxx
Don't buy GM
Posted on 9/13/26 at 2:35 pm to Jim bean xxx
I've used one for several years. gas mileage for sure improved just a little but not enough to matter. fuel is actually lost already those lifters when they are operating. if you get a disabler, get the name brand one bc the others aren't always firmware updated.
this only help if you don't already have stuck lifters.
quote:keeps you in V8 at all times. I don't know the specifics of dfm. mine has afm which is just between v4 and v8.
What exactly does it do and best brand?
this only help if you don't already have stuck lifters.
Posted on 9/13/26 at 3:53 pm to Jim bean xxx
I have one in my ‘14 Silverado. It’s the “range” brand. It keeps it at v8 24/7 and haven’t had any issues at all.
Posted on 9/13/26 at 3:59 pm to Jim bean xxx
I've not given it much thought.
A V6 engine is in my truck an on just a rare occasion, I see it go to V4. Very rare.
A V6 engine is in my truck an on just a rare occasion, I see it go to V4. Very rare.
Posted on 9/13/26 at 4:03 pm to AndyCBR
My wife has the 6.2 in her Yukon. I'm about to unload it for a Yukon with the baby Duramax. Throwing misfire codes intermittently, not a plug or coil. Sign of things to come I'm sure.
Posted on 9/13/26 at 4:24 pm to Jim bean xxx
quote:
Anyone installed one and was there improvement?
Is it a good thing for the engine and longevity ?
No.
Its better but its not a true DFM like swapping the cam and lifters
The lifters can still collapse.
Posted on 9/13/26 at 4:38 pm to Jim bean xxx
I also have a Range on my Yukon. Who knows if the motor will last longer. At least it turns off the stop/start. Luckily I have the 5.3. seems like the best of the 3 motors.
Posted on 9/13/26 at 4:42 pm to Jim bean xxx
quote:
Thoughts on dfm disabler for GM trucks
I have one on my 2011 Silverado and it works fine. NO noticeable fuel mileage change.
I bought mine off of Amazon for like 45 bucks.
Posted on 9/13/26 at 4:48 pm to Jim bean xxx
I’ll NEVER buy a car with this BS.
Posted on 9/14/26 at 6:26 am to LEASTBAY
quote:
Luckily I have the 5.3. seems like the best of the 3 motors.
I've had 2 Tahoes with that same engine. It would swtich between v4 and v8 and almost unnoticeable.
Posted on 9/14/26 at 6:38 am to Tempratt
quote:
I've had 2 Tahoes with that same engine. It would swtich between v4 and v8 and almost unnoticeable.
And that funky shifting.
Posted on 9/14/26 at 8:21 am to Jim bean xxx
Threads like this is why I tell my fiancee that her 2004 5.3L Silverado is worth keeping. Her engine is probably worth more now than it was in 2004... 
Posted on 9/14/26 at 8:27 am to BoogaBear
quote:
Throwing misfire codes intermittently, not a plug or coil. Sign of things to come I'm sure.
Get her a minivan or at least a non-GM
Posted on 9/14/26 at 8:30 am to Jim bean xxx
Dumb question for the thread: How can you tell if it's in V8 or V6?
Posted on 9/14/26 at 10:19 am to Jim bean xxx
I considered getting one for my wife’s Tahoe but its a PITA on those models, the plug is under the truck behind the firewall. We just roll it as is and bought an extended warranty. I’ve read that if you put it in L9, it’ll prevent it from dropping into 4 cylinder.
This post was edited on 9/14/26 at 10:20 am
Posted on 9/14/26 at 10:27 am to Jim bean xxx
I read a couple of years ago that driving it in L9 prevents it from going into the 10th gear which is where the fuel management system typically activates? I do that with our Tahoe. It’s a 2023 Z71 with 51k miles and I haven’t had any issues yet. Hopefully it’s working.
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